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Alternative names Return to top
BiomicroscopyDefinition Return to top
The slit-lamp examination looks at structures that are at the front of the eye (the anterior segment): The eyelid, the sclera (white outer structure of the eye), conjunctiva (membranes lining the eyelid and sclera surface), iris (colored part of the eye), natural crystalline lens, and the cornea (thin transparent membrane that covers the iris and the lens).
The slit-lamp is an instrument used with a high-intensity light source that can be focused to shine as a slit. It is used with the biomicroscope (an optical instrument that is like a microscope with two eyepieces).
How the test is performed Return to top
While you are seated in the examining chair, the instrument is placed in front of you and you rest your chin and forehead on a support to keep your head steady. Your eyes are then examined through the biomicroscope. A fine strip of paper that is stained with an orange-colored dye (fluorescein) may be touched to the side of your eye. The dye stains the tear film on the surface of the eye to help with the examination. The dye rinses out of the eye with tears.
After this examination, drops may be placed in your eyes to dilate the pupils. The drops take about 15 to 20 minutes to work. The examination is then repeated, allowing the back of the eye to be examined.
How to prepare for the test Return to top
Adults:How the test will feel Return to top
There will be light sensitivity for a few hours after the exam if dilating drops are used.
Why the test is performed Return to top
The test is used to examine the eyelids, sclera, lens, conjunctiva, iris, and cornea.Normal Values Return to top
Structures in the eye are found to be normal.What abnormal results mean Return to top
The slit lamp exam may detect many diseases of the eye, including:
What the risks are Return to top
The dilating drops may cause increased pressure in the eye with nausea and pain. This is very rare, but you should IMMEDIATELY return to your doctor's office if you experience either of these symptoms. Update Date: 10/27/2003 Updated by: Raymond S. Douglas, M.D., Ph.D., Department of Ophthalmology, UCLA Medical Center, Los Angeles, CA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |